Laundry folding machines



June 21, 1960 B. A. Buss 2,941,797

LAUNDRY FOLDING MACHINES Filed Oct. 3l, 1957 2 Sheets-Sheet l l fue rrw :m |901 r|00 L 55 L11 '5b 55 200M. se .ozz 214 7 zo :ab Q QQ"`\-20I 56. uz Moll3 EAT lo? l 3m-` 322 INVENTOR.

59; in zz xm BY Benjamin/41Min Blub. |016 T" 6o Llou- ATTORNEYS June 21, 1960 B. A. BUSS LAUNDRY FOLDING MACHINES 2 Sheets-Sheet 2 Filed Oct. 31, 1957 mfr/ENTOR. BYBen)a/mm Alm'm. Bm

9 www@ fm1 ATTORNEYS United States Patent() 2,941,797 LAUNDRY FOLDING MACHINES Benjamin Alvin Buss, East Moline, Ill., assignor to American Machine and Metals, Inc., East Moline, lll., a corporation of Delaware Filed Oct. 31, 1957, Ser. No. 693,718

6 Claims. (Cl. 27069) This invention relates to timer arrangements for folding sheets, and is particularly concerned with laundry folding arrangements.

One of the problems in folding mechanisms for laundry articles has been that of accuracy in the measurement of the length of articles of various sizes for actuation of the folding means. If the device does not measure the sheet accurately, incorrect folds may be produced.

One of the objects of the invention is to provide an arrangement having improved accuracy for folding articles.

In one aspect of the invention, a folding arrangement can be employed which is activated at predetermined times to place folds in a sheet passing adjacent thereto. The timing and measuring mechanism preferably may include a low-speed motor and a high-speed motor which can be activated by a sensing means responsive to the article being measured. When the article is passing over the sensing means, the flow-speed motor will be activated, the low and high-speed motors being connected by a means having cams thereon for closing circuits to operate the folding mechanism. The switch operates the W- speed motor during the time an article passes thereover and then is connected to the high-speed motor after the article has passed. In one form of the invention, the connecting means includes a pair of clutches arranged so that when the low-speed motor drives the connecting means, the high-speed motor will not necessarily be turning, and when the high-speed motor drives the same, the low-speed motor will not necessarily be turning. In a further form, a single clutch can be used in the connecting means. In this latter instance, it is desirable to have a means to stop the motor at the completion of the measurement. This may take the form of a rectifier and a pair of relays connected therewith. The stopping must be instantaneous and it is for this reason that special steps must be taken to insure such action. In a still further arrangement, the slow-speed motor or motors may be driven through a clutch and planetary gear arrangement. A further form is one wherein, upon application of power to the motor, the rotor pinion engages with the gear train. When the motor is deenergized, the rotor pinion disengages from the gear train.

In still another aspect of the stopping arrangement, a mechanical device can be provided wherein there is a cut or notch in a cam or wheel which cooperates with a spring pressed plunger urged toward and into said cut tending to rotate the shaft to a predetermined position when the plunger engages said notch. In normal operation, the connecting means will rotate and the motor will be stopped just after the plunger has entered the notch. The actuator then will complete movement of the shaft to its predetermined stopping position because of the spring.

These and other objects, advantages and features of the invention will become apparent from the following description and drawings which are merely exemplary.

In the drawings:

2,941,797 Patented June 21, 1,960

ICC

ment of a system in which the invention can be used;

Fig. 2 is a view of one form of the controller;

Fig. 3 is a modied form of the timing arrangement of Fig. 2;

Fig. 4 is a fragmentary View of a still further modified form and circuit therefor.

Fig. 5 is a side View of Fig. 4.

In the drawings, sheet A is illustrated on endless conveyor belt means 10, said belt being composed of the usual plurality of parallel ribbons passing around spaced rollers 11 and 12, the belt being driven in the direction shown by the arrow. Sheet A will be carried onto belt 13 which is guided by rollers 14, 15, 16, 17, 18. Endless belt means 19 cooperating with belt 13 is arranged to be guided by rollers so that sheet A will be gripped between said belts 13 and 19 and carried along a path therebetween. As the sheet passes over roll 17, it will be directed downwardly, its lower edge being guided by detlector shield 22, the sheet illustrated at C passing in front of a iirst folding station 23.

The folding actuators at each of the stations may take various forms and may for example, include a pneumatic blast means having manifold or pipe means 24 extending across the machine, air thereto being controlled by a suitable solenoid operated valve 25, the-valve being opened by a signal from the timing mechanism, as will be described hereafter.

When the sheet reaches a correct or desired position in front of the air blast as determined by the measuring and Itim-ing apparatus, air blast solenoid 25 is energized' so as to blow and move a center portion of the sheet between the first folding roll means 26 and 27. The sheet then will be drawn between the first folding rolls 26 and 27 and carried as indicated onto belt 2S. The roll means may comprise a pair of rolls or may be a roll and mating guide. Mating belts also may be used.

The folded edge B of sheet C then will be moved on belt means 28 so as to pass downwardly over roll 27A and in front of the second folding arrangement 29.

The second folding apparatus may include an air blast manifold or pipe 30 and solenoid 3-1 operable to control the ow of air from pipe 30 in a manner similar to the first station. The second folding roll means 32, 33 are arranged' suitably in front of the second folding station 29, belt 34 being guided by roll 33 and roll 35.

If a second fold is to be made in the sheet, the once folded edge B of sheet C will move downwardly as indicated in dotted lines 36 and be guided by the second fold station shield or guide 37. At an appropriate time and in proportion to the length of the sheet, the air blast folder 29 will be activated by the measuring and timing means so as to cause the desired portion of the sheet to move sidewise into gripping relationship between folding rolls 32 and 33. Y v A Y i The air blast solenoids 25 and 31 are actuated yat appropriate times inV accordance with the timing mechanism as governed by sheet measuring switch vorsensing finger 38. In the event that only a single fold is to be made, air blast 29 may be activated by the timing mechanism so that lthe leading edge B of sheet C receives :a blast of air before or as it reaches foldingrolls 32, 33 so that the leading folded edge B will be drawn directly between the rolls and carried to collecting station 39, such being described in detail in application Serial No. 579,947 filed April 23, '1956, now Patent No. 2,852,251 issued September 16, 1959.

The various rolls and belts are driven in a suitable manner by a constant speed motor 40, which'can be connected to line L1 and L2. The motor may bea fair blast means 23 at an appropriate time.

synchronous motor or any other typey f constant Spee/d motor arrangement.

In order to control successive operations of folding mechanisms 23 and 29 and provide the 'successive timed blastsv of air when a plurality of sheets, one following the other, pass through the machine, a plurality of timing mechanisms whichY comprise the principal aspect of this invention are indica-ted generally as 200. As many 'ot these as needed are provided, the illustrated form contemplating four, but onlyone being shown. Each of said timing mechanisms governs folding operations .of the air blast `folding means 23 and 29. Each timing mechanism may have a pair of subtiming devices, one foreach fold.

y Qne form of subtiming device is illustrated schematically in Fig. 1 and in detail in Fig.` 2, is designated gen- ,.erally by the reference numeral 201. For the half fold station/the low-speed synchronous motor 47 may oper- Y atewalt 71/2 r.p.m. and high-speed motor 56 may operate at 15 12pm., the speeds being chosen in accordance with the results desired. A second subtiming means 202 similar, to 20'1 can be used to provide an impulse or signal for the second fold, in such an instance the speed of the low-speed motor being chosen so that the fold will be inits proper or desired place.

Each of the subtiming devices 201 and 202 in the .timing mechanism 200 is controlled by measuring switch means 38 (Fig. l)` and motor switch means 41, other selector switches 42, 43, 44 being provided as indicated rin, block 45, said selector switches being operated, 'for example, by a cam means schematically shown at 46. Assuccessive sheets pass the measuring switch, successive ones of the timing devices 200, will be activated by selector switches 41, 42, 43, 44 so as to provide operation of the air blast means at the required time for each sheet. The above switching and sequencing arrangement is described in detail in copending application Serial No. 545,872 filed November 9, 1955, now Patent No. 2,858,129 issued October 28, 1958. Other types oi sequencing means can be employed.

Describing one of the subtiming means, and referring "to Figs'. l and 2, subtiming motors 47 and 56 can be rrang'e'd'to drive connecting means 210, the connect- `ing means including shaft 211 carrying cams or switch operators 212, 213. One way clutches 214, 215 are Yprovided 'so that when low-speed motor 47 is energized,

'high-speed motor 56 is not necessarily turning. Simila'rly', when high-speed motor 56 is energized, low-speedk ffnotor 47 is not necessarily turning.

Various types of one-Way clutch means can heused. One that has been found suitable has a coil spring therein 4indicated schematically at 150 and attached to one shaft of the clutch. Said spring will lgrip an internally mounted 151 Whenthe parts are rotated in one direction, said drum being connected to the other shaft of the clutch, and will provide free movement between said shafts when rotated in the other direction. Switches 53 and 55 are operable, by cams 212 and 213 at selected times.

K Switch 53 is placed at a predetermined location relative to camv 212 and servesrto operate the first station y Switch -55 is actuated by cam 213, switch S5 -which will assist in controlling energization of the high-speed -motor 56.

The other subtiming device 202, schematically indicated' in Fig. 1 is similar to subtiming device 201 and Acontrols operation of the second air blast folding means 29. The other timing means can be connected through lines 152 and 153 with the leads to the air blast actuating -means, switch 154 being used, if desired, to provide single or double fold operation. The latter aspect is described in detail in application Serial No. 579,947, now Patent No. 2,852,251 issued September 16, 1958. Switch 53 which is normally open is connected to supply line L.-2 by lead 100 and the fixed contact isy connected to Hfolding means V25 by leads 101, 102. vWhen switch 53 is allowed to close by cam 212, the air blast will be activated. Switch 55 is connected to high speed motor 56 by lead 105. Switch 59 of the second subtiming means 202 has its movable member connected to supply line L-Z by lead 106 and itsA contact is connected to folding means 29 by lead 107. Switch blade 60 is connected to supply line L=2 by lead 104 and the vtix-edV contact is connected to high speed motor 56 by lead 107A.

Measuring switch 38 is actuated by a sheet or other article between conveyor belts 13 and 19; A spring 38A, or other suitable biasing means, is provided to keep switch 38 V,in such a position that its article engaging portion is in position to be engaged by a sheet. In this position, the movable member 38B of the measuring switch engages xed contact 115, whereas when a sheet is passing and depresses the article engaging portion of the switch, the member 38B engages fixed contact 116.

.Switch member 38B is directly connected to supply L-1 through line 104, while contact is connected to contact 1.17 of timer switch 61 by lead 118. Contact 116 is connected to the other Contact 119 of timer switch 61 by leads 120 and `121. Leads 120 and 122 further connect contact 116 with one terminal of low speed motors 47 and 47".` A movable member 62 of timer switch 61 is connected to one terminal of motor 63 by lead `123.

47 .and to low speed motor 47 by lead 127. Motors 47 and 47 will be operable at different speeds in accordance with the fold desired. The other contact 128 of switch 41 is connected to high speed motor 56 by leads 130 and 131, and to high speed motor 56 by lead 130 and 131A. The remainder of the cam actuated switches Y42, 43 and 44 canbe similarly respectively connected to the other timing mechanisms.

It will be noted from the above description that each of the four motors 47, 56, 47 and 56' in timing mechanism 200 can be energized bythe supply lines L-1 and L-2. Thus, the connection of the drive motor 40 to lines LT1 and L-2 eiect'ively relates the speeds of the conveyor belts tothe speeds of rotation of the cams 212,

213, 212" and 213'; The speeds of the drive motor 40 and high speed .motor 56 and 556 .are so related that a -sheet between conveyor belts 13 and 19 would have its trailing edge .folding point positioned adjacent the point at which folding means 31 is operated when cam 212 Yhas completed a predetermined portion of a revolution.

The speed of low speed motors 56 and 56' is related to the speed of high speed motors 4'7 .and 47' in such a lmanner as to permit cams 212 and 212' to actuate switches 53 and 59 'at-times when the proportionately spaced points -of the Vsheet to be folded on the conveyor belt pass their respective means 23.

v AssumingV initially that only timing mechanism 200 is operated, both low speed motors 47 and 47 will be energized whenthe leading edge ofthe sheet engages measyuring switch V38. As soon as cams 213 and 213 start mj-rotate, the notches therein are moved out ot engagement with the followers of switches 53 and 5S, thus closing both of` saidfswitches. l High speed motors 56 and 56' 'are not energized at this time, however, since the movable memberot-cam actuated switch 41 is connected to contact V126-rather than contact 12S. Cams 212 and 212 operated by connecting means 211 through clutch 214 rotate at their low speeds until the trailing edge of the sheet passes the article engaging portion of measuring switch 38, lat which time spring 38A forces the movable member 38B into engagement with contact 115. At this point, actuated `switchv41is operated by the sequence controller 4 5, asdescribe'dlin-Serial No. 545,872, now Patent No. 2,858,129 issued October 28,;1958'toccnnect the movable member of switch 41 with contact 128 and thus energize the high speed motors 56 and 56'. When the high speed motors 56 and 56 are energized, cams 212, 212', 213 and 213 are rotated at high speeds until the f ollowers of switches 53 and 59 are engaged by the notches in the cams to operate folding means 23- and 29 at their correct times. Thus, it is evident that timing mechanism 200 operates in conjunction with measuring means 38 to selectively control the operation of folding means 23 and 29.

When both switches 38 and l61 are in their normal positions as shown by the full line construction in the drawing, the energizing circuit for motor 63 is open and the sequence controller inoperative. edge of a sheet placed on the belts actuate switch 38, an energizing circuit for 63 -is completed through lead 120 causing the motor 63 to rotate. At this time, the low speed motors of timing mechanism 201i would also be energized as hereinbefore explained. The motor 63 will continue to rotate until timer switch 61 is actuated to the dotted line position shown in Fig. l of the drawing, when the energizing circuit for the motor will 'be broken.

After the trailing edge of the sheet passes the article engaging portion of the measuring switch 38, spring 38A becomes operative to return switch 38 to its normal position. When this occurs, the energizing circuit for motor `63 is completed through 118 since the movable member of switch 61 is in the dotted line position shown. The cam mechanism in 45 is arranged so that motor 63 need only rotate a short distance before cam actuated switch 41 assumes its inoperative position and the neXt switch 42, its operative position. High speed motors 56 and 56 of timing mechanism 200, are still energized through switch 61 even though control by the measuring switch 38 has been transferred to the low speed motors of the next timing mechanism. Thus, cams 112 and 112 of timing mechanism 200 continue to rotate at high speed and close switches 53 and 59 which control folding means 23 and 29, respectively. When cams 113 and 113 have completed one full revolution, switches 55 and 60 are opened to deenergize the high speed motors.

Another form of the invention is illustrated in Fig. 3 wherein similar parts are given the same reference numerals as in Figs. l 4and 2 with the exception that the letter A has been added thereto. Low speed motor 47A drives connecting means 210A having a shaft 211A carrying cams 212A and 213A. Cams 212A and 213A are arranged to operate switches 53A land 55A which can be employed in the same manner as switches 53V and 55 of `Figs. l and 2. High speed motor 56A also is connected to shaft 211A. In the form shown in Fig. 3, the overrunning clutches in the connecting means are not used and instead motor 47A can be of the constantly operating type having a clutch arrangement 302 which when energized will turn shaft 211A, motor 56A being turned thereby. The clutch can be energized by connecting it with Contact 126 of Fig. l, so that energzation thereof will cause the low speed motor to drive the shaft 211A. Relay 1.62 or the normally closed switch can be connected to and arranged to be energized when clutch 302 is energized to open so that the rectifier 160 wi-ll not 4be able to cause braking of motor 56A by application of D.C. thereto. At completion of operation of the lowspeed motor 47A, switch 161 can -be closed by means operated by one of the cams so that even -if switch 162 is closed, no braking action will occur. Low speed motor `47A will drive the connecting means 211A, motor 56A being freely turned thereby. At the end of the measuring period, high speed motor 56A will be energized in the same manner as Figs. l and 2 until the stopping point in cam 213A is reached at which time shunt switch 161 will be opened, the shunt having been closed when motor 56A was energized. 'Ihe current now will iiow through rectifier 160 and closed switch 162 so that it acts as a Should the leading I brake on the high speed motor, the relay"162 and switch 161 having been actuated at the end of the measuring time, switch 167 having been closed previously. The rectifier thus is seen to be arranged so that D.C. is placed on the high speed motor at the required instant of stop of the apparatus, the rectifier being bypassed when the 15 rpm. is operating.

As a further aspect, in order to insure that the arrangement stops in the same place each time, sha-ft 211A may have a cam 163 thereon, said cam having the cutoutportion 164 engageable by a plunger 165. Plunger 165 may have a spring 166 urging the plunger into the notch or cutout of cam 164. When the power is shut off and plunger 165 enters notch 164, spring 166 will cause cam 163 to move shaft 211A to a predetermined stop position.

It is to be understood that modifications and variations may be made in the described mechanism and system without departing from the spirit of the invenion except as dened in the appended claims.

What is claimed is:

1. in a measuring and timing arrangement for a folding machine throughv which sheets to be folded are fed, the combination including means for conveying Sheets through said machine at a predetermined velocity, a high speed motor, a lower speed motor, shaft means connecting said motors to each other through one-way clutch mechanisms, sheet folding means, cam means mounted on said shaft means lfor operating switches connected with said folding means for actuating the same, and switches connected with said high speed motor for actuating the same, said switches being actuated when said shaft completes a predetermined cycle of angular displacement from an initial starting position, a sensing switch responsive to the passage of a sheet thereover, means connecting said switch to said low speed motor as a sheet passes thereover to activate the same and said shaft means at low speed from said initial starting position and through a portion of said predetermined cycle of angular displacement during the time that an article passes thereover, and means connecting said sensing switch to said high speed motor when the trailing edge of a sheet has passed thereby so as to activate said high speed motor and shaft means at high speed after the sheet has passed, the speed of said low speed motor being related to the predetermined velocity of said sheet conveying means, the distance along the path of travel of the sheets between said sensing means and said sheet folding means, and said predetermined cycle of angular displacement of said shaft means, the speed of said high speed motor being proportionately related to the speed of said low speed motor as t-he whole sheet is related to the portion to be folded, said high speed motor driving said shaft means and cam means through the remaining portion of said predetermined cycle of angular displacement so as to operate the folding mechanism Vswitches actuated by said cam means at a predetermined time thereafter in proportion to operate said switch connected with the high speed motor to the sheet being measured and to stop said measuring and timing arrangement upon completion of the Ifolding operation.

2. In a measuring and timing arrangement for a folding machine through which sheets to be folded are fed, the combination including means for conveying sheets through said machine at a predetermined velocity, a high speed motor, a lower speed motor, a shaft means for connecting said motors to each other through oppositely connecting one-way clutch means so that either motor can turn Said shaft means without necessarily turning the other motor, sheet folding mechanism, cam means driven by said shaft means for operating switch members for operating sai-d sheet folding mechanism upon said shaft completing a predetermined cycle of angular displacement from an initial starting position, a Vsensing t-he portion to be ifolded, said switch responsive to the .passage of sheets ou said com veyor means, means connecting said sensing switch to yactivate said low speed motorgduring the time that a sheet* is passing said sensing switch and thereby drive said shaft means and cam means at low speed from said initial starting position and through a portion of said predetermined cycle of angilar displacement, and means connecting said sensing switch to said high speed Vmotor so as to activate saidyhigh speed motor when the trailing edge of a sheet has passed said sensing switch, the speed of said low speed motor being related tothe predetermined velocity of said sheet conveying means, the distance along the path of travel of the sheets between said sensing switch and said sheet folding means, `and said predetermined cycle of angular displacement of said shaft means, the speed of said high speed motor -being proportionately related to the speed of said low speed motor as the whole sheet is related to the portion to Ibe folded, said 'high speed motor driving said shaft means and cam means at high speed through the remaining portion of said predeterminedy cycle of angular displacement, means connecting said switch -members operable by said cam -means to said folding mechanism to actuate the same so as to operate the `folding mechanism at a predetermined time after a sheet passes said sensing switch in proportion to the sheet being measured.

3. In a measuring and timing arrangement for a sheet 'folding machine through which sheets are fed, the combination including means -for conveying sheets through Ysaid machineat a predetermined velocity, a high speed motor, a lower'speed motor, connecting means for join- -ing said motors to each other through a clutch mechanism, sheet folding mechanism, cam means mounted on and driven by said connecting means havinglswitch members actuatable thereby for operating said sheet folding mechanism and switches connected with said high speed motor for actuating the same, said switches being actuated when said connecting means completes a predetermined cycle of angular displacement from an initial starting position, a sensing switch responsive to the passage of an article thereby, said switch being connected to activate said low speed motor during the time that an article is passing thereover to drive said cam means at a :low speed from said initial starting position and through a portion of said predetermined cycle of angular displacement, and means connecting said sensing switch to said high speed motor when the trailing edge of a sheet has passed thereby so as to activate said high speed motor after an article has passed thereover, the speed of said low speed motor being related to `the predetermined velocity of said sheet con- `veying means, the ldistance along the path of travel of ,the sheets between said sensing switch and said sheet folding means, and said predetermined cycle of angular vdisplacement of said shaft means, the speed of said high speed motor being proportionately related to the speed of said low speedvmotor as the whole sheet is related to high speed motor driving said connecting means and cam means at a high speed through the remaining portion of said predetermined cycle of angular displacement so as to operate the folding mechanism at a predetermined time thereafter in proportion to the sheet being measured and to operate saidfswitchconnected with the high speed motor to operate said switch connected to the high speed motor to [stop said timing and measuring means upon completion -the'reof, and mechanical positioning means adapted to engage said connecting means lfor positively positioning said connecting means when said connecting means stops. f

4. `In afrneasuring and timing arrangement for a sheet folding' machine through which sheets are fed, the combination including means for conveying sheets through saidmachine at a predeterminedvelocity, a high speed motor, a lower speed motor, connecting means for joining said motors to each other through a clutch mechanism, sheet Vfolding mechanism, cam means mounted on .and driven by said connecting means having switch members actuatable thereby for operating said sheet foldingv mechanism and to control said motors and having switch members connected with said high speed motor for actuating the same, said switch members being actuated when said connecting means completes a predetermined cycle of angular displacement from an initial starting position, a sensing switch responsive to the passage of an article thereby, said switch being connected to activate said low speed motor during the time that ari article is passing thereover so as to operate said cam means at a low speed from said initial starting position and through a portion lof said predetermined cycle of angular displacement, and means connecting said sensing switch to said high speed motor so as to activate said high speed motor after a sheet has passedthereover, the speed of said low speed motor being related to the predetermined velocity of said sheet conveying means, the distance along the path of travel of the sheets between said sensing switch and said sheet folding means, and said predetermined cycle of angular displacement of said shaft means, the speed of said high speed motor being proportionately related to the speed of said low speed motor as the whole sheet is related to the portion to be folded, said -high speed Ymotor driving said connecting means and cam means at a high speed through the remaining portion of said predetermined cycle of angular displacement so as to operate the folding mechanism at a predetermined time thereafter in proportion to the sheet being :measured and to operate said switch connected with thehigh speed motor to stop said timing and measuring means upon completion thereof, and electrical circuit means connected to said motors and actuatable by one of said switch members for positively stopping the same at a predetermined position.

5. In a folding control mechanism for sheets fed through a folding machine, the combination including means for conveying sheets through said machine at a predetermined velocity, a low speed A.C. electric motor,

va higher speed A.C. electric motor, connecting means for joining said motors to each other through a clutch mechanism, a folding mechanism, a sensing -means operable to actuate said low speed motor and high speed motor so that when a sheet is passing over said sensing means, the ,low speed motor will be actuated and said high speed motor when the trailing edge passes said sensing means, said motors driving said connecting means through a predetermined cycle of angular displacement from an initial starting position, the speed of said low pass switch being closed when said high speed motor is actuated by said switch mechanism after an article has passed thereover, and means disconnecting said by-pass arrangement so that direct current is applied to said high speed motor upon completion of the measuring action Yso as to stop said connecting means in a predetermined position.

6. In a measuring and timing arrangement for a folding machine through which sheets are fed, the combina- Vtion including a conveyor means for moving sheets at a predetermined velocity, a high speed A.C. electric motor, a lower speed A.C. electric motor, connecting shaft means for joining said motors to each other through clutch means, sheet folding mechanism, folding mechanism cam means driven by said connecting means for operating said folding mechanism, a sensing switch responsive to the passage of a sheet thereover, means connecting said sensing switch to activate said low speed motor during the time that a sheet passes thereover to drive said cam means at a low speed, electric line means connecting said sensing switch to said high speed motor so as to activate said high speed motor after the trailing edge of a sheet has passed thereover, said high speed motor driving said connecting means and cam means so as to operate said folding mechanism at a predetermined time thereafter in proportion to the sheet being measured, said motors driving said connecting means through a predetermined cycle of angular displacement from an initial starting position, the speed of said low speed motor being related to the predetermined velocity of said sheet conveying means, the distance along the path of travel of the sheets between said sensing switch and said sheet -folding mechanism, and said predetermined cycle of angular displacement of said connecting means, the speed of said high speed motor being proportionately related to the speed of said low speed motor as the whole sheet is related to the portion to be folded, said electric line to said high speed motor having a rectier means connected therein and adapted to supply D.C. thereto, and means rendering said rectier means inactive until completion of the operation and then actuating the same so as to apply D.C. thereto and stop said cam means in a predetermined position.

References Cited in the le of this patent UNITED STATES PATENTS 2,659,598 McLagan NOV. 17, 1953 2,774,592 Kagan Dec. 18, 1956 2,777,689 Martin Jan. 15, 1957 2,804,298 Buss Aug. 27, 1957 UNITED STATES PATENT OFFICE CERTIFICATE 0F ""CGRTRECTION Patent No, 2,941,1797 June 2l, 196C.

Benjamin Alvin Buss lt is herebjr certified that error appears in theprinted specification of the above rmrnberecV patent requiring-correction lunflinmt the` said` Letters Patent should read as corrected below..

Column 6; lines 59V 60 and 6lv strike out "operate said switch connected with the high speed motor to the sheet being measured and" and insert instead the` sheet being measured and to operate said switch connected with the high speed motor M,

Signed and sealed this llth day of April 1961e {SE/XL) Attest:

ERNEST W" SWDER THU W. QROCKER Attesting Ofcer Acting Commissioner of Patents 

